Statistics

Despite being an everyday occurrence for some parts of the world, earthquakes can be highly destructive forces, and even more so in coastal areas due to the additional risk of tsunami. While the time is still unpredictable, the size of the wave can be predicted as soon as the magnitude…

This week I work with Time Series objects in R and make use of Holt-Winters Forecasting and exponential smoothing to find the trend in seemingly random data. For this I created an R script which you can find on my GitHub here, or with the link at the bottom of…

In this post I go over data analysis using chi-tests and data visualization techniques. For the R code I use, you can find it on my GitHub here, or follow the link at the bottom. The following table is real data collected from a hotel quest satisfaction study. The hotels…

This week focused on Analysis of Variance (ANOVA) testing, which is a test that can be used for data with 2 or more groups and can reduce Type I errors. To perform the analysis in this post I wrote an R script to speed up the process. The code is…

The data is from a study whose research hypothesis was: “There will be a difference between boys and girls in the number of times they raise their hand in class.” For the purposes of this study, boys were coded as 2 on gender; girls were coded as 1. I wrote some…

First Question:The director of manufacturing at a cookies needs to determine whether a new machine is production a particular type of cookies according to the manufacturer's specifications, which indicate that cookies should have a mean of 70 and standard deviation of 3.5 pounds. A sample pf 49 of cookies reveals…

Part 1. Confidence Interval Estimation Questions when the mean is known Equation 1: Pulled from assignment page 1. x̄ = 85 and σ = 8, and n = 64, set up a 95% confidence interval estimate of the population mean μ.  Using the given equation and plugging in for the appropriate values, the following…

For this week's blog post I make an attempt to answer questions my professor gave me regarding sampling and confidence interval estimation. For the R code I used, you can find it here or use the link at the end of the article. Question 1 A publishing company has just…